<template>
  <div>
    <!-- 头部导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" show-icon :closable="false"></el-alert>
      <el-row>
        <el-col>
         <span>选择商品分类：</span> 
        <!-- 级联选择框 -->
        <el-cascader
         props.expandTrigger="hover"
         v-model="seletedCateKeys"
         :options="cateList"
         :props="cateProps"
         @change="handleChange"
         clearable>
        </el-cascader>
        </el-col>
        
      </el-row>
      <!-- 页签 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" :disabled="isBtnDisabled" size="mini"  @click="dialogVisible = true">添加参数</el-button>
          <el-table :data="manyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)">
              </el-input>
              <!-- 按钮 -->
              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">
              + New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" :disabled="isBtnDisabled" size="mini" @click="dialogVisible = true">添加属性</el-button>
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <el-input
                 class="input-new-tag"
                 v-if="scope.row.inputVisible"
                 v-model="scope.row.inputValue"
                 ref="saveTagInput"
                 size="small"
                 @keyup.enter="handleInputConfirm(scope.row)"
                 @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">
                + New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="dialogVisible"
      width="30%" @close="addFormClose()">
      <!-- 表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label='titleText' prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>  
      <template #footer>
        <span class="dialog-footer">
          <el-button @click="dialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams()">确 定</el-button>
        </span>
      </template>
    </el-dialog>
    <!-- 修改对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editialogVisible"
      width="30%" @close="editFormClose()">
      <!-- 表单 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label='titleText' prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>  
      <template #footer>
        <span class="dialog-footer">
          <el-button @click="editialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams()">确 定</el-button>
        </span>
      </template>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data() {
    return {
      cateList: [],
      // 级联选择器双向绑定的数组
      seletedCateKeys: [],
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 页签激活状态
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性参数
      onlyTableData: [],
      // 显示与否
      dialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 验证规则
      addFormRules: {
        attr_name: [
           { required: true,message: "请输入参数名称",trigger: 'blur'}
        ]
      },
      // 修改框显示与否
      editialogVisible: false,
      editForm: {
        attr_name: ''
      },
      editFormRules: {
        attr_name: [
           { required: true,message: "请输入参数名称",trigger: 'blur'}
        ]
      },
      

    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品分类列表
   async getCateList() {
      const {data:res} = await this.$http.get('categories')
      if(res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败！')
      }
      this.cateList = res.data
    },
    // 级联选择器change
    handleChange() {
      this.getParamsData()
    },
    // 点击页签
    handleTabClick() {
      this.getParamsData()
    },
    async getParamsData() {
      // 选中的不是3级
      if(this.seletedCateKeys.length !== 3) {
        this.seletedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中了3级
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
      {
       params: {sel: this.activeName}
      }                         
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }

      // console.log(res.data);
      // 分割
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ?
        item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 内容
        item.inputValue = ''
      })
      if (this.activeName == 'many') {
        this.manyTableData = res.data
      }else {
        this.onlyTableData = res.data
      }
    },
    addFormClose() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) return
        const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if(res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.dialogVisible = false
        this.getParamsData()
      })
    },
    // 点击编辑按钮
    async showEditDialog(attr_id) {
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
        params: {attr_sel: this.activeName}
      })
      if(res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.$message.success('获取参数信息成功！')
      this.editialogVisible = true
    },
    // 点击确定
    editParams(){
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name: this.editForm.attr_name, attr_sel: this.activeName
        })
        if(res.meta.status !== 200){
          return this.$message.error('更新失败')
        }
        this.$message.success('更新成功')
        this.getParamsData()
        this.editialogVisible = false
      })
    },
    // 关闭
    editFormClose() {
      this.$refs.editFormRef.resetFields()
    },
    // 根据id删除参数
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if(confirmResult !== 'confirm') {
          return this.$message.info('取消删除')
        }
        // 删除的业务逻辑
        const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status !== 200) {
          return this.$message.error('删除失败！')
        }
        this.$message.success('删除成功！')
        this.getParamsData()
    },
    // 键盘弹起或失去焦点
    async handleInputConfirm(row) {
      if(row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 没return时
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 保存操作
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
      {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join()
      }
      )
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
      this.$message.success('修改参数成功！')
    },
    // 点击tag时
    showInput(row) {
      row.inputVisible = true
      // 自动获取焦点
       this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 删除对应的参数
    async handleClose(i, row) {
      row.attr_vals.splice(i,1)
       // 保存操作
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
      {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join()
      }
      )
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
      this.$message.success('修改参数成功！')
    }
  },
  computed: {
    isBtnDisabled() {
      if (this.seletedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    cateId() {
      if (this.seletedCateKeys.length == 3) {
        return this.seletedCateKeys[2]
      }
      return null
    },
    titleText() {
      if (this.activeName == 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style>
.el-card {
  margin-top: 15px;
}
.el-col {
  margin: 15px;
}
.el-table {
  margin-top: 15px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 100px;
}
</style>